S.B. No. 15 amends the Local Government Code by adding a new subchapter that establishes size and density requirements for residential lots in certain municipalities in Texas. Specifically, it applies to municipalities with populations over 150,000 that are located in counties with populations exceeding 300,000. The bill defines "small lot" as a residential lot of 4,000 square feet or less and prohibits municipalities from adopting ordinances that require residential lots to be larger than 3,000 square feet, wider than 30 feet, or deeper than 75 feet. Additionally, it restricts regulations that would prevent single-family homes from being built on lots of at least 3,000 square feet.

The bill also outlines various provisions regarding small lots, including limitations on setback requirements, parking, and open space. Municipalities are allowed to impose certain fees related to permitting and impact, but they cannot enforce restrictions inconsistent with the new regulations. Furthermore, the bill clarifies that it does not affect existing zoning authority or homeowners' association rules. Individuals adversely affected by a municipality's violation of this subchapter can bring legal action for relief, including the possibility of attorney's fees for prevailing claimants. The act is set to take effect on September 1, 2025.

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